Experience orbs when dropped don't drop in a stack like items do, so when a player dies when they have a large number of experience, each orb has to be processed individually. This will cause a high amount of lag, especially for SMP servers.

Double chests placed before 1.8 on multiplayer servers all appear to players to be facing the same direction, even when they should be rotated by 90 degrees.

The Item Selection screen in the new Creative game mode is missing pine and birch leaves, tall grass, double slabs, monster spawner, snow cover, and both huge mushroom blocks.

NPC villages occasionally spawn over partial water areas and 'float'

Even though the Far Lands had been corrected, fake chunks still generate (but now generates at X/Z 30,000,000). Also, most of the effects of the Far Lands still exist, although terrain still generates correctly.

When you sleep,the day/night cycle does not advance but only spawns a hostile mob.

If a piston is activated and it disrupts a redstone wire, torch, repeater, pressure plate or any other block providing power and doing so will cut power to the piston in the same tick, the game will crash and become unloadable. Using any map editor to remove the offending blocks and entities will make the map loadable again.

When crushed by pistons (or what they're moving) or when inside while it contracts, the player will be moved out of the way or into impossible places, on SMP this usually throws a "User moved wrongly!" warning.

In rare cases, when redstone travels semi-long distances (almost 15 blocks), the current won't go through all the redstone, even with a repeater just before the end of the signal. Whether this is due to redstone errors or inter-block interaction errors, it is unknown.

The door duplication bug is back again, this time happening when a piston pushes on the lower half of a door. If it is a normal piston that does it, then the piston can be destroyed and the bottom half of the door works like a normal door.

When putting torches all around a bed in SSP, you will not sleep until daytime. (?)

When pillaring, it is possible to get stuck and repeatedly go into the block below you. If you disconnect and come back, you will be on the block above your head. If you are in the nether and way up near the top, you will skip to on top of bedrock.

When you disconnect (SMP) at the bottom of a very high wall and reconnect to the server, sometimes your y position have been increased so you are in the air beside the wall, but you don't fall.

Fixed a couple of instances where beds would act strange in multiplayer, primarily the "already occupied" bug.

New Bugs

On some computers, every few seconds, there is a huge drop in FPS lasting only a fraction of a second. This bug was noticed in version 1.6.5.[8][9]

Memory leaks. When a chunk unloads, its block textures and data are still present in the client's RAM, even if you cannot see the chunk anymore.

Sometimes blocks will fail to render, creating massive holes on the ground and walls, allowing the player to see caves and dungeons under the map. This probably happens when Minecraft runs out of memory.[10][11]

Setting Framerate Limit to 40 FPS may increase CPU usage on some computers.[12]

Difficulty may revert to "Easy" when you load a save, at least when you had it previously on "Peaceful."

Respawn after death results in being stuck until breaking block below. Does not occur at all spawn points.

Beds have numerous issues in SMP; players may sleep during night, but nothing will happen as the game thinks you're trying to sleep. This allows the player to sleep and walk freely at the same time. When all players are asleep, a few seconds later the game teleports you back to the bed and the normal post-sleeping effect will occur.

Setting view-distance=7 (or lower) in server.properties causes part of the maps (item) to revert.[13]

In SMP, sometimes when entering the World from the Nether, the sky will remain red.

Minecarts stopped on E/W powered rail will not bounce off one another, but they will on N/S powered rail.

On unlit powered rail as part of a track which terminates at a solid block to the North or to the East, a minecart can be shoved off of the track directly into the block, by a player or by another minecart.[14]

If you ⇧ Shift+click an item into a full chest, the client will not crash, but the server does.

Sometimes when trying to lie down on a bed, it fails and removes one half of a heart in SMP.

Walking in a corner in certain circumstances results in falling in the next block (tested on leaves).

You cannot place redstone on TNT anymore.

Left clicking on a series of Doors/Trap Doors will open all within range of your punch instead of the first.

Blocks displaced by half steps can only be collected from the side, not the top (Although the blocks are visible)

Mobs don't despawn from chunks you are no longer in. (SMP Fix)

Clay is almost nonexistent in newly generated worlds. Clay only generates if the x and z coordinates are the same.

SMP: When too many items are generated at once (Entity Overload / Large amount of Explosions) the client will fail to update some of them. It finally results in glowing passive TNT or all kinds of inventory items lying around, respectively. Both only vanish after a logout.

Sometimes when you open a world you can get stuck for a short time (about 0.10 seconds).

Entering and exiting the nether in SMP resets health bar, but not health.

Dropped tools, once picked up, disappear after first use.[15] Also if you die your tools can suffer a similar fate. If you shift-transfer such a dropped tool into a chest and back in your inventory, it's like a new-crafted tool without uses.

Holding a map in a boat can cause the arms to be misplaced. This can be fixed by exiting the boat, and opening your inventory.[16]

If a player sleeps in a bed, sometimes the bed is listed as occupied (even though it isn't) and, upon logging out, there is a NullPointerException and the player's .dat file is corrupted. There is an end of stream error when the player tries to log back in and their .dat file needs to be restored from a backup. This can be fixed by changing the sleeping value in the player's .dat file from 1 back to 0; this solves the issue and the player can then log back in. (You have to un-zip the .dat file first, otherwise the file just looks like gibberish)

If a player crashes in the nether in SMP, some times when they reconnect, they spawn on top of the Nether. The only way back is death, or using teleportation.

Sometimes freezes most water into ice regardless of if its in a snow biome or not.

CPU issue fix is still failing, same loop as 1.6.3

Sometimes blocks will fail to render, creating massive holes on the ground and walls, allowing the player to see caves and dungeons under the map.[10][11]

Cobweb now acting like a solid block, player can pass through it, but he/she will get damaged.

You are able to travel down through a "closed" Trapdoor/Hatch (Under certain circumstances).

If the player is crouched while saving, he/she will then (when loading the world) spawn an additional 1.62 meters higher, and visibly fall to the ground (unhurt). However, if this occurs while standing under a solid block (such as a low ceiling), then the player will suffer 0.5 hearts of damage from clipping into the block temporarily ("suffocation"). Warning, also occasionally happens even when not crouched! (See Bug Report.)

All TNT-entities stay client-side after exploding, until reconnection. (New bug because before just random ones stayed)

⇧ Shift+clicking to transfer items to/from chests, dispensers and storage minecarts can result in the game crashing if the items' destination would become full, or if there is no room for the new item.

Can't move and can mostly only see sky and sea when server.properties "view-distance" is set above 5. Note that the default is 10.

Hostile mobs sometimes spawn when using a bed even in a well lit room sealed off from outside environments, this appears to possibly be related to the lighting bug mentioned above (this can be an old bug: see File:Bed Template.png). Double doors also cause this to happen, the game somehow ignores one of the doors allowing mobs to spawn inside.

Craftable maps sometimes don't display the correct name, become blank or have gaps.

When crafting an item, ⇧ Shift+clicking may cause different items to be created if the elimination of resources would create a situation in which that item can be crafted. For example, having 1 stone in the top left and two in the top middle and top right, along with two sticks in the middle and bottom middle, ⇧ Shift+clicking will create a pick and a hoe.

When riding a boat with a map out, the player sometimes dies for no apparent reason.

Light bugs found in 1.6.2 can now occur in old generated chunks (not only in those generated in 1.6.x).[22]

When climbing a ladder in a 1x2 shaft, under certain circumstances, it is impossible to target a block opposite of the ladder. The cursor will repeatedly alternate between the wall and another block, usually the ladder.

The corruption of world when running out of memory fix does not always work.

Maps may cause crashes or instability on multiplayer servers. When maps are used the server usually crashes in the same way: CPU usage goes to 100% and short after the server kicks all player and stops responding.

Mushrooms can spread through walls.

Lava, in SMP, anywhere near wood, even if blocked by glass, will set the wood on fire. Have observed wood catching alight that is 10 blocks away from the lava source.

The item duplication bug was not actually fixed; items placed in a furnace can still be taken out of a furnace and duplicated infinitely by right-clicking (although it appears the newly duplicated item will not function). Also, bug with cloned items being picked up after death wasn't fixed too.

When using a furnace and placing items into it, as soon as it's activated all items minus 1 are ejected and must be placed back in the furnace in order to use it.

Lighting is not always updated when digging new holes/tunnels, placing torches or setting blocks on fire (in both nether & normal world).

Tall grass can grow on dirt with no grass on it.

Shift-clicking something into a full chest from inventory or from chest into full inventory crashes the client.

It is now impossible to row a boat in 1 block deep water.

Sometimes (tested while in a boat on water, and when floating in water) while viewing a map the game will switch to a "saving chunks screen" then end on a black screen.

When quitting game the "Saving Chunks" progress bar does not appear sometimes.

When loading a world and standing in a cave less than 4 blocks high, the player gets some initial damage (at least the damage sound appears).

"Out of memory" error. Often appears after the "blocks don't disappear" bug.

The following bugs only occur in new chunks generated in 1.6.2:

Some chunks don't get dark at night (and vice versa; some chunks stay dark during the day).

The textures don't load on some chunks (The blocks are present but with transparent textures).

Some blocks don't disappear after being broken; it appears as if the block is still there, but can be passed through.

Sleeping in a bed now resets your spawn position, though does not work for most users. Apparently, at the moment the spawn point unintentionally only changes if "Leave bed" is clicked and the function is limited to SMP.[31]

Sneaking while climbing will hang on to the ladder, thus being a handy cave tool.

Scale of UI may now be changed in options.txt located in the .minecraft folder.

On a fresh install, modded blocks are removed from the map. This excludes modded blocks that are placed into chests.

Bug fixes:

Zombies and Spiders now hurt you in all instances (previously could only hurt you if they were 1 block above your location).

Client-sided slime spawn on SMP has been fixed.

Arm no longer swings when you cannot place a block.

Opening and closing the inventory quickly while swinging no longer removes the character 'swinging' animation, which previously made destroying blocks faster (SMP only).

New Bugs

If a player hits himself with an arrow, any tamed wolves will attack the player.

Tamed wolves whimper in SMP regardless of health. This is because client-side health was used instead of synchronizing the health level with the server's.[32]

Wolves cannot travel through doors. A small hole can be punched out near the door as they are 1x1, thus creating a "doggy-door" until their pathfinding is updated to recognize open doors as a path they can walk through.

Beds do not act as the spawn point as intended, especially if it changes without reloading the save. In most instances, it is unconfirmed that the spawn point is even changed at all.

Several light calculation glitches were introduced, which can be seen when destroying or placing a block near tree leaves and other translucent blocks in Fast or Fancy graphics settings, or loading a new chunk that contains overhangs.

Sometimes torches do not emit light, but can be forced to by placing a light emitting torch near them. If these torches are removed, the light will not go away.

In SMP, a Monster Spawner that spawns pigs will spawn client side pigs. Like other client-side glitches, they cannot be attacked and upon a re-join, will vanish.

In SMP, most (If not all) Redstone Pulsars / Blinkers will not work.(The change time command causes all circuits to malfunction. Server mods that affect server time also seem to affect circuits. Strangely enough, in SSP any mods used to change time will not disrupt circuits in any way.)

Slimes can be killed, but split into smaller slimes regardless of weapon used. Only one split slime can be damaged, the others are 'ghost' slimes which disappear upon reconnecting.

The game will occasionally crash if you enter a Nether portal while in a minecart.

Levers can be placed on the bottom of a block, as long as there is an open space, and a block horizontal to the open space. The lever will act as if placed on the horizontal block, but looks glitched, as shown here: Media:Brokenlever.png

If someone uses their bed in SMP, other players may get disconnected. (Un-Recognizable Packet ID: 17)

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